If you are currently running CA 1 12.6 and have installed CA 1 14.0 you can dynamically upgrade using the instructions found in the Install Guide for CA 1 14.0. If you do the dynamic upgrade you can do a dynamic back out of CA 1 14.0. These instructions are in the Install Guide following the dynamic upgrade instructions.

If you should choose to do an IPL to upgrade to rel 14.0 then to back it out you will have to do an IPL.